Guerrero was originally banned for 12 months but that has been changed to six months after an appeal, meaning the striker will be eligible to go to Russia.

The news is a big boost to Peru and its chances of success at the World Cup.

The South American nation will come up against France, Denmark and the Socceroos in Russia.

FIFA said in a statement: "The FIFA Appeal Committee after taking into account all the circumstances of the case, in particular the degree of fault of the player, considered a six-month period of ineligibility to be a proportionate sanction.

"The player tested positive for the metabolite benzoylecgonine, a substance included in WADA’s 2017 Prohibited List under the class “S6. Stimulants”, following a doping control test conducted after the match of the preliminary competition of the 2018 FIFA World Cup Russia played in Buenos Aires, Argentina, on 5 October 2017.

"By testing positive for a prohibited substance, the player has violated article 6 of the FIFA Anti-Doping Regulations and, as such, contravened article 63 of the FIFA Disciplinary Code."

Guerrero will be free to resume playing football again from May 4, 2018.

The 33-year-old former Bayern Munich and Hamburger SV forward is Peru's all-time leading goalscorer.